brawler carburetor tuning

I had a problem like a couple weeks ago of my car running rich at idle, couldnt figure it out till someone on here suggested advancing my initial timing quite a bit. There may be dirt or corrosion inside that can plug circuits and restrict fuel flow. Holley Quick Fuel Brawler Carburetor,650 Cfm,4150,4 Barrel,Electric Generally these restrictors are permanently drilled passages in the metering block. Now shoot a little WD-40 or other lube on the threads of the four screws. HGM's AccuLink is a very slick stainless steel conversion kit that adds a GM-style TPS sensor to all popular Holley, Q-Jet, and Edelbrock carbs. If the main jets feel right and the engine is too rich under full throttle, then you can also reduce the size of the channel restrictions. Failure to follow the proper installation and tuning may result in damage or injury. Quick Fuel BR-67319 Brawler Street 750 Cfm Vs Black Series, How to Improve Engine Sound With A Camshaft Lobe Lift. Required fields are marked *. An increasingly popular swap is to use the electronically controlled 4L60E or 4L80E automatic overdrive transmissions in older muscle cars. EFI has many advantages thatallow us to dial in the fuel in a dramatically more precise fashion than was ever possible with a carburetor. For peak power, most engines like an air/fuel ratio of 12.8 to 13.2. Murphy prefers later-model boosters with the gentler radius at the bend that improves flow and its inside diameter is slightly larger at 0.160 inch versus stock at 0.140 inch. Make changes that stabilize the vacuum gauge needle. Here's where a little knowledge can make you a master carb tuner. If you have a Holley without a choke, you're still in luck. was thinking about putting my 1" open on it just to try. Im running a 3.5pv now with 68/79 jets with pretty close engine specs to yours. These components are usually necessary for most street driven vehicles, especially in cold climates, but can usually be eliminated in most racecar applications. Okay, now comes the fun part. Thats where the power valve circuit comes in. We wrote the first of many electronic fuel injection stories way back in 1988 in which we proclaimed that the carburetor, if not dead, was on the clear path to antiquity. A good place to start is with the factory setting or -turn out on the adjustment screw. So you bought a newer 0-3310 vacuum secondary 750 Holley for a great price, but later you realize it is the 4160 style with the secondary metering plate. Automatic chokes are supposed to make cold starting easier, but usually require some trial-and-error adjustment to find the best setting. However, setting the vacuum secondary opening point requires trial and error road testing of the vehicle. Higher altitudes and decreasing barometric pressure thin the air, which causes the carburetor to run rich. If the carb will be subsequently used on a milder-cammed engine, it will probably not be possible to return the curb idle speed low enough because of the permanent holes. The first step is to obtain a low-speed tach that will show minor changes in rpm along with a vacuum gauge. As part of our small block Ford build, we decided to use Holleys Terminator X EFI system for plug and play Ford V8 engine control. If there is no stepit has not and is a good candidate for this procedure. gonna call my builder today and see if he has any info. NOTE: Adjusting fuel pressure with the engine running could cause a fire hazard. Do this 2 times. 540hp small cubic inch and close to 600hp with 400 cubic inch, all on pump gas. Aug 25, 2018. One way to do that is to increase the size of the power valve channel restrictors. Clamp the shaft in the vise and then carefully lower the lid in place. If the engine will idle at 14:1 air/fuel ratio that's really good. Too lean is even worse. An engine only runs as well as it is tuned. Black carbon deposits on the center insulator and electrodes would indicate an overly rich A/F mixture (or the spark plugs are too cold for the engine). 2023 Holley Performance Products, Inc. All Rights Reserved. Brawler BR-67213 750 CFM Brawler Street Carburetor Mechanical - Holley Place the base on top of the vise and slide the diaphragm through the lower half until it sits flush. In fact, the HGM AccuLink is designed to work with Holley, Q-jet, and the Edelbrock carburetors. If you've ever tried to change the vacuum secondary spring in a Holley diaphragm module, you know it requires dexterity and patience. Once you understand them, you can spend many enjoyable hours perfecting the fuel curve for your engine combination. The proper way to check fuel pressure is with the engine running at idle with the engine up to full operating temperature. You can build a killer motor using all the best parts and machine and assemble everything with the utmost care, but if its a carbureted engine and the carburetor isnt set up or tuned right your killer engine may never live up to its full potential. They offer all the tunability and options that you would find from more expensive carburetors in the market, including a beautiful appearance, electric choke, and four-corner idle adjustment on all mechanical secondary models. Brawler | #424BR67199. To improve our situation, we contacted the officials at Brawler about a four-barrel (4bbl) carburetor to replace the restrictive 2bbl. We also interviewed Holley carburetor tuner/restorer Sean Murphy of Sean Murphy Induction (SMI) to document a few of his tuning and assembly secrets. Was nowhere near close out of the box. Make one adjustment only to the first screw. If the initial change results in a loss of rpm or vacuum go back to the baseline and then turn the idle mixture screws in the opposite or counterclockwise direction. You can identify these carbs by the four vertical holes adjacent to the air cleaner stud that allows air (controlled by the adjustment screw) to bypass air past the throttle blades. Brawlers come with the latest technology in air/fuel calibrations for todays street or race engine demands. Holley's kit is simple to install, using a standard TPS sensor adapted to follow the primary throttle linkage movement, but this kit does require a carburetor using an electric choke. BTW, the MSD dizzy has 1 light blue, and 1 light silver spring on the advance, all in by 2400-2500. what are your thoughts on the vacuum advance? lowered idle back down to 1,000 rpm. If the power valve is too big, it may cause the A/F ratio to run too rich when the engine is under load. But don't despair if you have a Holley with straight boosters. As soon as the weather changes, track condition changes, or other changes are made (like valvetrain lash, spark timing, etc. Holley Brawler Carburetor Installation How-To and Basic Tuning Pole Barn Garage 26K views 11 months ago Setting up a rebuilt carburetor. The conversion kit (foreground) replaces the metering plate like on the 4160-style carb on the left and replaces it with a metering block like the 4150-style carburetor on the right. But if your vehicle has an adjustable pressure regulator, set it for the ideal 6.5psi. If clearance exists, merely adjust the pump linkage with a pair of 3/8-inch wrenches. I understand it, but I guess after so many years of racing, my brain is locked into the old racers mindset that you just lock the dist. If the secondary side opens too quickly the engine will bog. A low fuel level can make the A/F ratio run lean, while a fuel level that is too high can make the carburetor run rich or even flood the engine with fuel. carburetor tuning and adjustments tech Quick Fuel Technology (QFT) ships carburetors only after they have been thoroughly run-tested and adjusted on a typical engine. Find Best Carburetor for Small Block 400 and about 400 sbc carb size. The information supplied above should get your carburetor and engine in sync and pretty happy with each other. Carburetor is a box stock tune Quick Fuel Brawler 750 Dual Line feed, 4 corner idle, manual secondaries, electric choke, adjustable everything. RetroBright LED Headlights offer plug & play compatibility, better visibility, and 6 times longer life over traditional sealed beam headlights. Idle mixture screws are very responsive. The moment the throttle linkage moves, fuel should exit the nozzle. Set the idle mixture for the best idle quality along with the leanest air/fuel ratio. The carburetor will also deliver the optimum air/fuel ratio throughout the engines RPM range to achieve peak horsepower and torque. Turning the screw in slows the opening rate, turning it out makes the secondaries open sooner. Specs Service Parts Non-Stick Gasket Assortment 4150 Part# BR-67220 $19.19 Qty: Add To Cart When making adjustments -turn at a time is a good way to proceed. carb used on the dyno was an old Baker Induction piece (builder from here in PA) dont know the exact specs on it unfortunately, just it flowed 950 cfm. Brawler BR-67200 750 CFM Brawler Race Carburetor Mechanical - Holley Check price here. If they are black, your jetting is too rich. Is the carburetor body, top plate and throttle housing flat and free from fuel or vacuum leaks? If the two do not match, the ECU makes small changes by either adding or subtracting from the commanded fuel in the fuel table to equalize the two. Tools Bible is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising & linking to Amazon properties. The best fix is to have a shop like SMI mill the body. Simply as an Amazon Associate, we earn from qualifying purchases. We went to Zach Baker, a technician at QFT that spends much of his time talking customers through the correct tuning procedures, to give us his proven step-by-step carb tuning tips to get the most out of your carburetors performance. But there are a couple of other points worth mentioning. The first would be to lower the power valve opening point to 65 (which is stock at 6-1/2 inches Hg) that would open the power valve later when the engine vacuum is lower, with a greater load. Any carb that will bolt onto the manifold may be used and thats a real problem because a lot of guys over-carb their engines. just crazy rich. Do not overtighten the idle mixture screws as doing so can damage the needle tips. Quick Fuel Technology BR-67212 Brawler Street Carburetor Holley makes several kitsmainly for either the 0-3310 750 cfm or the 0-1850 600-cfm carbs. It can replace Holley, Edelbrock, Carter AFB, and Autolite style carburetors with 5 3/16 x 5 5/8 bolt pattern. With carbureted engines, its an ongoing process of tweaking and adjustment to find the settings that deliver the best performance. Once you get the main jetting where you want it, it will probably be too lean for full throttle, full power runs. A carburetor that is adjusted properly during installation will give a solid baseline for fine-tuning to achieve maximum performance. Brawlers performance based race carburetors start off with a high flowing aluminum main body, and billet aluminum metering blocks that are packed with performance based air fuel calibration. Engine testing all carburetors prior to shipment ensures that when a new QFT carb is bolted on an engine, it will start, idle and perform up to the customers expectations. I, Dencan Brain BOIDAR, call myself a Torque master. The Brawler family of carburetors delivers bare-knuckled performance for daily drivers, race cars, and everything in between. In case you're taking notes, the secondary metering block is the main difference between 4160 and 4150 carburetors. Drivability is just as important, and that requires a lot of air velocity for instant throttle response and good low to mid-range torque. Much of this is determined by the tightness of the converter. Another indication if the main jets are correct is how the car drives. For those who know Holley carburetors, if you have a choice about which carburetor to buy, the recommendation is to always go with a carburetor with dropped instead of straight leg boosters. Brand: Brawler CFM: 650 Choke: Electric Circuit: 2 Emission Code: 3 Finish: Shiny Fuel: Gasoline Fuel System: Carbureted High Speed Air Bleed: 28:28 Idle Air Bleed Size: 70;70 Material: Aluminum Model: Brawler Diecast Primary Main Jet: 70 Primary Power Valve: 6.5 Primary Pump Nozzle Size: 31 Primary Venturii Size: 1.300" Product Type: Carburetor The newer HP and Ultra XP carbs come with screw-in restrictors. That is primarily determined by the amount of engine vacuum available at idle.